By Topic

Intrinsic Spatial Resolution and Parallax Correction Using Depth-Encoding PET Detector Modules Based on Position-Sensitive APD Readout

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)
Dokhale, P.A. ; Radiat. Monitoring Devices Inc., Watertown, MA ; Silverman, R.W. ; Shah, K.S. ; Farrell, R.
more authors

We are developing PET detectors with depth of interaction (DOI) capability based on lutetium oxyorthosilicate (LSO) scintillator arrays coupled at both ends to position-sensitive avalanche photodiodes (PSAPDs). The detector module consists of a 5x5 block of LSO crystals (1.5times1.5times20 mm3) coupled to 8times8 mm2 PSAPDs at both ends. We present the intrinsic spatial resolution for two complete modules and the radial resolution component obtained with and without parallax correction using DOI information. DOI resolution was measured to be ~3 mm. Intrinsic spatial resolution (FWHM) averaged 1.15 mm for opposing crystal pairs. The detectors were then rotated and moved closer together consistent with a 16 cm diameter cylindrical geometry scanner. Resolution was measured at positions corresponding to a radial offset of 4.7 cm and 7 cm, with the annihilation photons incident on the detector surface at 30deg and 52deg respectively. At an angle of 52deg the intrinsic spatial resolution was degraded to 7.7 mm. By incorporating DOI information, the measured spatial resolution (FWHM) was improved to 1.8 mm. This demonstrates that approximately 90% of the resolution degradation due to the parallax error can be removed using these depth-encoding detectors for a field of view with a diameter that is 87.5% of the detector separation

Published in:

Nuclear Science, IEEE Transactions on  (Volume:53 ,  Issue: 5 )